Styling of checkbox input in email template

I have a form with a checkbox, which looks fine (http://www.adosan.dk/gratis-prove).

However, the layout/styling of the input from the checkbox iss not so clear in the email and looks like this (only the checkbox is shown here):

Prøver på følgende Adosan produkter:
array ( 0 => 'Adosan HøjEnergi', 1 => 'Adosan HøjProtein', )

How can I setup the email template so "array ( 0 =>" is not shown, but only the value?
Is it possible to set up the email so each value is shown on separate lines?

The code in the email template is:
<p>Prøver på følgende Adosan produkter:<br />{checkbox_group12}</p><br />

Thanks for your help.

Hi Bibbi,

Please drag a Handle Arrays action into the OnSubmit event and move it up before the Email action.

Bob

The Handle Arrays action was already in place, but I deleted it and added it again, and now it works fine.

Thanks for your help.